Newly assigned national parks rangerAnna Pigeon seeks solace from her own personaldemons in the ancient cave dwellings of a vanished NativeAmerican civilization. But an inexplicable illness affectingvisitors to the popular Colorado landmark has dragged herfrom her reverie -- as have two mysterious tragedies: thedeath of a child ... and the murder of a friend. And now shemust find the very human source of the evil wind that isblowing through the ruins. For it threatens more innocentlives, Mother Nature ... and Anna herself.